Earlier today, talented developer alephzain described a security vulnerability affecting most if not all Exynos 4 devices, which represent dozen of millions gadget out there.
Unfortunately he also released a working exploit with complete source code before the various vendors affected (Samsung, Meizu and surely others) were made aware of it, leading to a severe security issue without accessible fix for now.
I wrote then an application to circumvent the issue while manufacturer patch the security hole and publish OTA updates.
Characteristics of this app:

Cannot protect efficiently against some potential attacks (typically, on boot).The real fix by manufacturers or some carefully written custom kernels will indeed be the only true solutions to this vulnerability − and won’t introduce any feature regression like this one does with some firmwares on cameras.